$\log_a\left(\frac{1}{4}\right)$
$-6x^2-108x-510=0$
$\:xy-2x^2-y=3$
$x^2+x+1\ge0$
$7n-4=-32$
$3x-6=x-14$
$x-2-\left(x-\left(x+2\right)\right)$
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